The FDA, the Centers for Disease Control and Prevention and the Hawaii Department of Health have launched an investigation, the advisory said. Of 29 reported cases in Hawaii, one person has died, two have received liver transplants, and 11 have been hospitalized with acute hepatitis.

USPLabs LLC, the Dallas-based company that manufactures OxyElite Pro, issued a statement to the website NutraIngredients-USA.com, saying it will stop distributing two products sold under that name "out of an abundance of caution.'' It called the outbreak in Hawaii "a complete mystery" and said it is cooperating with the FDA investigation.

The FDA has warned supplement companies before about products containing dimethylamylamine, or DMAA, as OxyElite Pro does. In a warning issued this past April sparked by 86 reports of illness or death connected to DMAA, the FDA specifically mentioned OxyElite Pro and USPLabs.